[#BloombergLP-bslmf-NthParameter-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::NthParameter
:relfileprefix: ../../
:mrdocs:

Metafunction to compute the specified `t_N`th element of the specified `t_PARAMS` template parameter pack. The `Type` nested typedef will match the `t_N`th element of `t_PARAMS`, where `t_N` is zero‐based (so that an `t_N` of zero corresponds to the first parameter.

== Synopsis

Declared in `<bslmf_nthparameter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::size_t t_N,
    class t_FIRST_PARAM = xref:BloombergLP/bslmf/NthParameter_Sentinel.adoc[NthParameter_Sentinel],
    class... t_PARAMS>
struct NthParameter;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/NthParameter-06/Type.adoc[`Type`] 
| The type of the Nth parameter, computed by recursively stripping off the first parameter until t_N == 0.
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/NthParameter-056.adoc[`NthParameter<0, NthParameter_Sentinel>`] 
| Specialization of `NthParameter` for when `t_N` exceeds the actual number of parameters.
| xref:BloombergLP/bslmf/NthParameter-050.adoc[`NthParameter<0, t_FIRST_PARAM, t_PARAMS...>`] 
| Specialization of `NthParameter` for when `t_N` is zero.
|===



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